You should be very careful using a very colourful stone especially when it has a lot of texture. The danger is: this stone can overwhelm the space. Use light monochrome colours in the interior to make the precious stone look in its best light! In this way the stone becomes the centre of attention and that would increase the value of the gem a lot!

Another way to make your granite stand out is to use similar colour furniture. This way furniture will not take a lot of attention but empower the beautiful texture of the granite.